What are the characteristics of technical subject retrieval compared with comparative literature retrieval?

1, technical topic retrieval: it is a retrieval method for specific technical topics, such as the retrieval of documents, patents and other resources for specific fields or technologies.

2. Comparative literature retrieval: it is a retrieval method for specific patents or technical documents, and its purpose is to find documents or patents similar to a technical scheme or patent application. Search methods such as keywords and classification numbers are usually used to find documents or patents similar to the target technical scheme.